Thread: Are these Barber's hones still good?

Well folks the old man has found more treasure for his son, this time it is two Barber hones. They appear to have some kind of crap on the surface, are they any good still? I asked if there was any writing in the oval on the one on the right and or any place else on either stone and dad says no there isn't any. If they are good still will I have to lap them? If so what will I need to do that?

Thanks!